This is a wonderful British Arts & Crafts pendants in the Suffragette colours Green, White & Violete which stand for Give Women the Vote, made around 1910. The central stone and pendant are amethysts, surrounded by silver and green leaves. I believe the green leaves may be glass but they could also be carved chrysoprase. There is some damage to the central stone, but I actually don't mind it, being so beautiful in its totality. No maker's mark, unfortunately.